The shark-like pre-sturgeon, Chondrosteus, enters the LRT

The nesting of Chondrosteus with sturgeons
is not controversial.

However,
the nesting the traditional ‘bony fish’ Chondrosteus and sturgeons with sharks and ratfish is heretical and documents only part of the evidence for a multiple genesis of bony fish. In the large reptile tree (LRT, 1499 taxa) Chondrosteus (Fig. 1) nests as a shark-like sturgeon from the Early Jurassic, at which time it was a late survivor of a much earlier (likely Silurian), genesis and radiation.

Chondrosteus and sturgeons share a last common ancestor
in the shark-like Cladoselache, which we looked at earlier here.

Chondrosteus acipenseroides (Agassiz 1848; Egerton 1858; Hilton and Forey 2010; Early Jurassic) is a prehistoric sturgeon without dorsal armor. It is traditionally considered a ray fin fish but nests in the LRT with ratfish and Cladoselache. Most of the skull is poorly ossified.

References
Agassiz L 1848. Nomenclatoris zoologici index universalis: continens nomina systematica classium, ordinum, familiarum et generum animalium omnium, tam viventium quam fossilium, secundum ordinem alphabeticum unicum disposita, adjectis homonymiis plantarum, nec non variis adnotationibus et emendationibus.
Egerton PdMG 1858. On Chondrosteus, an Extinct Genus of the Sturionidaek, Found in the Lias Formation at Lyme Regis. Philosophial Transactions of The Royal Society of London 148:871–885.
Hilton EJ and Forey PL 2010. Redescription of Chondrosteus acipenseroides Egerton, 1858 (Acipenseriformes, †Chondrosteidae) from the lower Lias of Lyme Regis (Dorset, England), with comments on the early evolution of sturgeons and paddlefishes. Journal of Systematic Palaeontology. 7(4):427–453.

wiki/Chondrosteus